I guess our "no water" comes from our dojo have old school roots. IE predrinking straws. We never have a break, we move from session to session rather quickly. Since those with bogu on can't drink, it is customary for everyone to wait. I guess using water bottles with straws makes a lot of sense. We just don't do it though. Obviously if someone is feeling faint, theyd tell the sensei and be allowed water, but that's never come up. I never have felt the need for water though. I usual drink after, but I'm not dieing of thirst. I just make sure I'm hydrated before class starts. thanks for the the input... any one else?